Besides making it easier for their own mediocre kids to get into college (less competition), one thing that gets forgotten -- many view college as a networking opportunity, not education. To them, letting in poorer kids with no "worthy" connections wastes their own kids' time and their money.
“You are unworthy of the things I wish for my family and you should be shepherded from first grade to a life that I would rather intern my children than have them live” is unfeeling condescension masquerading as policy